128055643 has 2 divisors, whose sum is σ = 128055644. Its totient is φ = 128055642.

The previous prime is 128055623. The next prime is 128055661. The reversal of 128055643 is 346550821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128055643 - 2¹⁷ = 127924571 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128055599 and 128055608.

It is not a weakly prime, because it can be changed into another prime (128055623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64027821 + 64027822.

It is an arithmetic number, because the mean of its divisors is an integer number (64027822).

Almost surely, 2^128055643 is an apocalyptic number.

128055643 is a deficient number, since it is larger than the sum of its proper divisors (1).

128055643 is an equidigital number, since it uses as much as digits as its factorization.

128055643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 128055643 is about 11316.1673282079. The cubic root of 128055643 is about 504.0414362401.

The spelling of 128055643 in words is "one hundred twenty-eight million, fifty-five thousand, six hundred forty-three".